How to Place or Clear a Map Marker
To place map markers, simply open the world map by pressing M on your keyboard. Once you’ve opened your map, simply click one of the five different icons that can be found in the lower right corner. With the icon selected, double click the area on the map that you would like to mark to create a marker that can you then name anything that you like.
To clear a marker, simply right-click in order to delete it from the map.